Hello and welcome

You might start with easy reversible steps, like changes to hair and clothing style.
and see how it makes you feel... I'd say go with a feeling of joy....
second hand stores could be a good source for clothing...
I'd say take the time you need but keep at it...
its a process, but many have been there before and succeeded, and people here will try to support you.
And you might keep asking questions, alone writing might help getting a better view...
You might think about a good gender therapist... a supportive person to help you along...
if they are not supportive you might look for another...
you might ask at trans groups, plannedparenthood, a lgbt center or a school counselor you trust for a referral...
hugs